Fear not, for I am with you, be not dismayed, for I am your God; I will strengthen you, I will help you, I will uphold you with my victorious right hand. Isaiah 41:10
If you ever feel like giving up, remember that there's someone out there that looks up to you. Do it for them. We tend to forget that happiness doesn't come from getting something we don't have, but from recognizing and appreciating what we do have. Grudges are a waste of perfect happiness. Laugh when you can, apologize when you should, and let go of what you can't change.